JPS5459814A - Noise limiting circuit - Google Patents

Noise limiting circuit

Info

Publication number
JPS5459814A
JPS5459814A JP12659477A JP12659477A JPS5459814A JP S5459814 A JPS5459814 A JP S5459814A JP 12659477 A JP12659477 A JP 12659477A JP 12659477 A JP12659477 A JP 12659477A JP S5459814 A JPS5459814 A JP S5459814A
Authority
JP
Japan
Prior art keywords
aural
output
signal
noise
modulation wave
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP12659477A
Other languages
Japanese (ja)
Inventor
Yasuo Iwamoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP12659477A priority Critical patent/JPS5459814A/en
Publication of JPS5459814A publication Critical patent/JPS5459814A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
    • H03G3/345—Muting during a short period of time when noise pulses are detected, i.e. blanking

Landscapes

  • Noise Elimination (AREA)

Abstract

PURPOSE:To prevent the undesirable noise from being applied to the aural output by generating the pulse signal corresponding to the noise, inhibiting the output of the aural signal during the period of generation of the pulse signal, and obtaining the output inerpolated with the aural signal before inhibition. CONSTITUTION:HF amplification 1 is given to the amplitude modulation wave signal of the radio frequency supplied through antenna 1a, and IF obtained through frequency conversion 2 is amplified through IF transformers 3, 5 and 7. Thus, signal detection 8 is carried out. The output of circit 8 is set to a proper gain at the variable resistor 12 via gate circuit 9 and capacitor 10 and then delivered after the aural amplification through low-frequency amplifier 12. Here, if the noise is supplied, the amplitude modulation wave signal branched off through capacitor 15 is detected (16) and the greater part of the noise passes through BPF17 to undergo pulse shaping 18. And the aural signal is attenuated largely and transmitted to gate circuit 9 to block the output of the reproduced modulation wave signal. Instead, the aural signals stored in capacity 10 before inhibition are interpolated to avoid application of the undesirable noise to the aural output.
JP12659477A 1977-10-20 1977-10-20 Noise limiting circuit Pending JPS5459814A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12659477A JPS5459814A (en) 1977-10-20 1977-10-20 Noise limiting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12659477A JPS5459814A (en) 1977-10-20 1977-10-20 Noise limiting circuit

Publications (1)

Publication Number Publication Date
JPS5459814A true JPS5459814A (en) 1979-05-14

Family

ID=14939039

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12659477A Pending JPS5459814A (en) 1977-10-20 1977-10-20 Noise limiting circuit

Country Status (1)

Country Link
JP (1) JPS5459814A (en)

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